Chiral dopants for liquid crystalline mixtures

Details Chiral dopants for liquid crystalline mixtures Chiral dopants for liquid crystalline mixtures

1994-09-12

1995-05-02

Harris, C.

Compositions

Liquid crystal compositions

Containing nonsteryl liquid crystalline compound of...

25229901, 2522996, 560 76, C09K 1930, C09K 1952, C09K 1906, C07C 6976

Patent

active

054116767

ABSTRACT:
Optically active dopants of the formula ##STR1## wherein A represents an optically active group selected from 1,1'-binaphthyl-2,2'-diyl, --CHR.sup.1 --CHR.sup.2 -- or --CH(COOR.sub.3)--CH(COOR.sub.4)--; Z denotes a group --(CH.sub.2).sub.4 --, --O(CH.sub.2).sub.3 -- or the trans form of --OCH.sub.2 --CH.dbd.CH--; R is hydrogen, methyl, phenyl or cyclohexyl; R.sup.2 is methyl, phenyl or cyclohexyl; R.sup.3 and R.sup.4 denote alkyl; Y stands for --CO-- or --CH.sub.2 --; ring B represents 1,4-phenytene or trans-1,4-cyclohexylene; and R is hydrogen, alkyl, alkoxy or cyano,
liquid crystalline mixtures which contain such dopants and their use for optical and electro-optical purposes.

REFERENCES:
patent: 4264148 (1981-04-01), Gobl-Wunsch et al.
patent: 4650600 (1987-03-01), Heppke et al.
patent: 4826620 (1989-05-01), Heppke et al.
patent: 4886619 (1989-12-01), Janulis
patent: 4988458 (1991-01-01), Heppke et al.
patent: 5043094 (1991-08-01), Takano et al.
Heppke et al., "Chiral Dotierstoffe", Handout at 15th Symposium on Liquid Crystals in Freiburg, Germany (1986).
Derwent Abstract of 3 534 777 No. 87-094723/14.
Derwent Abstract of DE 3,633,967.

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